Number System If A + B = 30 and AB = 94, What is the value of A² + B² ? 712 824 920 625 712 824 920 625 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (A + B)² = (30)² = 900A² + B² + 2AB = 900Therefore, A² + B² = 900 - 2 x 94 = 900 - 188 = 712
Number System (4300731) - ? = 2535618 1865113 1775123 1765113 1675123 1865113 1775123 1765113 1675123 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let 4300731 - x = 2535618Then, x = 4300731 - 2535618 = 1765113
Number System If (182)² is added to the square of a number, the answer so obtained is 47765. What is the number ? 131 111 101 121 131 111 101 121 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be xTherefore x² + (182)² = 47765Therefore x² = 47765 - (182)2 = 47765 - 33124Therefore x² = 14641, Therefore x = 121
Number System Complete the series : 11, 12, 17, 18, 23, 24 ... None of these 30 14 12 None of these 30 14 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP None of these
Number System A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ? 51/340 45/340 39/340 58/340 51/340 45/340 39/340 58/340 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 4 + 6 + 7 = 17∴ n(S) = 17C1 = 680Two red balls can be selected from four red balls in 4C2 = 6 ways.and the third ball can be selected from the remaining 13 balls in 13C1 = 13 ways.∴ P (E) = 13x6/680 = 39/340
Number System 384×12×2=? 9216 6123 7487 8465 9216 6123 7487 8465 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 9216
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